Supplementary Central Furnace Installations - A-Maize-Ing Heat NRP620-10 Owner's Manual

Supplementary Central Furnace Installations

The warm-air supply outlet of the supplementary furnace should not be connected to the
cold-air return inlet of the central furnace because a possibility exists of components of
the central furnace overheating and causing the central furnace to operate other than as
When installing the furnace as a supplementary "add-on" furnace, install the unit in a parallel air flow
configuration with the central furnace and install back draft dampers (BDD) to prevent feedback from
one furnace to the other as illustrated below.
SUPPLEMENTARY
FURNACE
NRP620-9 OMEPAPV20161017 (ENGLISH) REV 1
WARNING
intended.
COLD
AIR
RETURN
WARM
AIR
SUPPLY
BDD
COLD
AIR
RETURN
DUCT
COLD
AIR
RETURN
WARM
AIR
SUPPLY
WARM
AIR
SUPPLY
DUCT
CENTRAL
FURNACE
BDD
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